这是一个奇特的岛屿，所有事物的诡异消失，都可能受历着某种未知的魔力，但让年轻科学家严国（陈坤）几乎崩溃的是，神秘植物开花的一刹那，他却忽然昏厥，而女友宝宝也突然消失。这一切打破了小岛的安宁，也让一直暗恋严国的白兰（桂纶美）日渐忧虑，却无法走进他为宝宝而封锁的内心。就在此时，女记者杨霖的突然到访，却告知了他们更可怕的“危机”，一场科学之战悄然侵袭着严国的世界，但他浑然不知，真正挽救一切的，却是那只一直陪伴在他左右的神秘蝴蝶，和她所经历的奇异之军！有一种魔力，它穿越彼此、穿越时空、甚至穿越生灵，只为那深刻于灵魂的爱恋。

In an unspecified time when epidemics run rampant, botanist Yan Guo and his fiance-assistant Baobao move to Moon Island, a nature reserve, to research the curing properties of rare plants. As is customary, they pray to the magical Eros Tree to cement their love, unaware that they have to undergo a severe trial, in which Baobao must remain unseen to Yan for three years in exchange for his life.